US4820482A
Expired / Lapsed
US
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Cemented carbide body with a binder phase gradient and method of making the same
Assignee: Santrade Ltd
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Filing: 1987-05-05
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Granted: 1989-04-11
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Expires: 2007-05-05
Abstract
Abstract The present invention relates to a cemented carbide body, preferably for rock drilling, mineral cutting and wear parts, in which the content of binder phase in the surface is lower and in the center higher than the nominal content. In the center there is a zone having a uniform content of binder phase. The WC grain size is uniform throughout the body.
Inventors
- 👤 Udo K. R. Fischer
- 👤 Erik T. Hartzell
- 👤 Jan G. H. Akerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:50
CPC Classifications
C; C22; C22C; C22C29/00; C22C29/02; C22C29/06; C22C29/08; C23; C23C; C23C30/00; C23C30/005; C23C8/00; C23C8/06; C23C8/08; C23C8/20; B; B22; B22F; B22F2998/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
77 words
Cemented carbide body comprising WC and a binder metal selected from the group consisting of cobalt, iron, nickel and alloys thereof, the grain size of the WC being uniform throughout the body, wherein the binder metal content in the surface is from 0.1 to 0.9 and the binder metal content in the center is at least 1.2, of the nominal binder of the cemented carbide body, said cemented carbide body being essentially free of eta phase carbide.
Claim 2
Dependent Claim
77 words
Cemented carbide body comprising WC and a binder metal selected from the group consisting of cobalt, iron, nickel and alloys thereof, the grain size of the WC being uniform throughout the body, wherein the binder metal content in the surface is from 0.1 to 0.9 and the binder metal content in the center is at least 1.2, of the nominal binder of the cemented carbide body, said cemented carbide body being essentially free of eta phase carbide.
Claim 3
Dependent Claim
28 words
The cemented carbide body of claim 1 wherein the said center of the body comprises a portion of from 0.05 to 0.5 of the diameter of the body.
Claim 4
Dependent Claim
22 words
The cemented carbide body of claim 2 wherein the said portion comprises from 0.1 to 0.3 of the diameter of the body.
Claim 5
Dependent Claim
34 words
The cemented carbide body of claim 1 wherein the binder metal content in the surface of the body is from 0.4 to 0.7 of the nominal amount of the binder metal in the body.
Claim 6
Dependent Claim
18 words
The cemented carbide body of claim 1 wherein the WC grain size is from 0.5 to 8 μm.
Claim 7
Dependent Claim
18 words
The cemented carbide body of claim 5 wherein the WC grain size is from 1 to 6 μm.
Claim 8
Dependent Claim
31 words
The cemented carbide body according to claim 1, characterized in that the content of the binder phase in the center of at least 1.4-2.5 of the nominal content of binder phase.
Claim 9
Independent Claim
84 words
A method of making a cemented carbide body comprising (i) sintering a mixture of WC having a substoichiometric amount of carbon and a binder metal selected from the group consisting of cobalt, iron, nickel and alloys thereof to form a sintered body including WC, binder metal and eta phase carbide and then (ii) carburizing the sintered body sufficient to remove all eta phase thereby producing a carburized body having a lower binder metal content in the surface than in the center of the body.
Claim 10
Independent Claim
84 words
A method of making a cemented carbide body comprising (i) sintering a mixture of WC having a substoichiometric amount of carbon and a binder metal selected from the group consisting of cobalt, iron, nickel and alloys thereof to form a sintered body including WC, binder metal and eta phase carbide and then (ii) carburizing the sintered body sufficient to remove all eta phase thereby producing a carburized body having a lower binder metal content in the surface than in the center of the body.
Claim 11
Dependent Claim
19 words
The method of claim 8 wherein the carburizing is conducted at a temperature of from 1200° to 1550° C.
Claim 12
Dependent Claim
19 words
The method of claim 8 wherein the sintered body is carburized in an atmosphere of methane or carbon monoxide.
Claim 13
Dependent Claim
39 words
The method of claim 8 wherein the binder metal content in the surface is from 0.1 to 0.9, and the binder metal content in the center is at least 1.2, of the nominal binder metal of the carburized body.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |